package ds.tree;

public class PrintKDistantNode {

	private static class TreeNode{
		int value;
		TreeNode left = null;
		TreeNode right = null;
		
		TreeNode(int val){
			this.value = val;
		}
		
		public String toString(){
			return String.valueOf(value);
		}
	}

	public void printKNode(TreeNode node, int k){
		if(node == null){
			return;
		}
		if(k == 0){
			System.out.print(node + " ");
		}
		
		printKNode(node.left, k - 1);
		printKNode(node.right, k - 1);
	}
	
	private static TreeNode tree(){
		TreeNode A = new TreeNode(1);
		TreeNode B = new TreeNode(2);
		TreeNode C = new TreeNode(3);
		TreeNode D = new TreeNode(4);
		TreeNode E = new TreeNode(5);
		TreeNode F = new TreeNode(6);
		TreeNode G = new TreeNode(7);
		
		A.left = B;
		A.right = C;
		B.left = D;
		B.right = E;
		C.left = F;
		C.right = G;
		
		return A;
	}
	
	public static void main(String[] args) {
		PrintKDistantNode printKDistantNode = new PrintKDistantNode();
		printKDistantNode.printKNode(tree(), 2);
	}

}
